Concrete floor construction



Oct. 3, 1933. H. F. YOUNG -.CONCRETE' FLOOR CONSTRUCTION Filed Dec. 9, 1929 2 Sheets-Sheet 1 INVENTOR award i. You/7 A TTORNEYE Oct. 3, 1933. H. F. YOUNG CONCRETE FLOOR CONSTRUCTION Filed Dec. 9, 1929 2 Sheets-Sheet 2 IIIIIII/III/lfi 'IIIIIII/IIIII A INVENTOR BY goward I? Yiuzy ATTORNEY Patented Oct. 3, 1933 UNITED STATES PATENT OFFICE CONCRETE FLOOR. CONSTRUCTION Howard F. Young, Kalamazoo, Mich., assignor of This invention relates to improvements in concrete floor or roof construction.

The objects of the invention are: First, to provide a simple and economical reinforced concrete floor or'roof structure.

Second, to provide such a floor or roof structure in which pre-cast concrete I-beams are made especially available.

Third, to provide such a roof structure in which the joists or beams are effectively retained by shoulders of concrete.

Fourth, to provide an improved method or process of constructing such a floor or roof in which the forms and centers are very readily supported and removed on completion of the work and the use of shoring avoided, the structure being such that complete curing is not essential to the removal of the forms. I

Objects pertaining to details and economies will appear from the description to follow. A form and structure embodying my invention and showing my process appear in the accompanying drawings, in which:

Fig. 1 is a fragmentary isometric projection taken from below, the floor being broken to show details, the side walls or joists or partition supports being omitted.

Fig. 2 is an enlarged detail transverse sectional view through the I-beam or joist, the adjacent floor structure and the supported ceiling below, considerably enlarged over that appearing in Fig. 1.

Fig. 3 is a detail side elevation view of a fragment of one of my pre-cast beams employed in this structure, showing the projecting ends of the transverse reinforcement rods bent down into the longitudinal position in which the beam is pre-cast, the main reinforcement being shown projecting at the broken beam end.

The parts will be identified by their numerals of reference. I

1, 1 are a pair of pre-cast concrete I-beams, made in accordance with the method defined and claimed in a concurrent patent application and consequently will not need to be described here in detail. 2, 2 are longitudinal tension strands and 3 is the head or compression strand. These are united at intervals by vertical shear strands 4 welded or otherwise secured tothe said longitudinal strands and having upwardly projecting ends 41 and downwardly projecting ends 42. The beams are preferably provided with apertures 5 for reducing the weight and to provide convenient supports and attachment for brackets, passage of pipes and the like.

In the manufacture of my improved floor, I hook over the I-beams, saddles 6 with stirrups or hooks 7 projecting outwardly and laterally from the said I-beams. Between the beams I support sheet metal forms 8 arched at the top 50 to form a slab 9 which is thinnest at the center between the joists and has shoulders 91 each side of the joist. The form reaches up to the head and into substantial contact with the lower edge of the head of the I-beam. The forms 8 have vertical sides to give them the necessary strength and support.

Before the concrete 9 is poured, I place mesh wire or other suitable reinforcing 10 on the tops of the beamsso that it is disposed in the bottom 7 portion of the floor slab. The ends 41 and 42 of the shear reinforcement are bent up and down respectively, preferably in the midplane of the joist, the ends of the hooks being deflected towards the center of the span of the joist which assists very materially in preventing any end slippage between the slab and the joist and anchors theparts together temporarily until the floor is poured. This, of course, also provides a permanent shear reinforcement bond in the com- 30 pleted structure.

When the forms 8 are in position and the mesh reinforcements 10 are in place, the floor is poured.

As soon as it sets at all, the stirrups 7 can be bent down or cut off and the forms 8 removed so that 35 they are at once released for further work. The same can be conveniently nested so that they can be taken readily by truck from place to place and continue their service as forms indefinitely.

The downwardly projecting ends 42 are made use of to support metal lath, or sheet lath of any kind, where it is desired to provide a finished ceiling for the structure, as detailed particularly in Fig. 2. Such structure also addsto the value and effectiveness of the fireproofing.

Having thus described my invention, what I. claim as new and desire to secure by Letters Patent, is:

1. A concrete'floor or roof construction comprising pre-cast I-beam joist with longitudinal reinforcing strands in head and base with cross shear strands welded thereto and having projecting ends, and a floor slab supported thereon with slab reinforcement in the lower portion thereof engaged by the said projecting cross strand ends hooked towards the span center, the said concrete being formed with shoulders embracing the heads of said joists.

2. A concrete floor or roof construction comprising-pre-cast I-beam joist with longitudinal 11 reinforcing strands in head and base with cross shear strands welded thereto-and having projecting ends, and a floor slab supported thereon with slab reinforcement, the said concrete being formed with shoulders embracing the heads of said joists.

3. A concrete floor or roof construction comprising pre-cast I-beam joist with longitudinal reinforcing strands in head and base with cross shear strands welded thereto and having projecting ends, and a floor slab' supported thereon with slab reinforcement in the lower portion thereof engaged by the said projecting cross strand ends hooked towards the span center.

4. A concrete floor or roof construction comprising -a plurality of pre-cast concrete joists spaced apart, and the said joist reinforced with longitudinal reinforcing strands in top and bottom and having cross shear strands welded thereto, and a floor slab carried on forms or centering and having slab reinforcement supported from the top of the joists, the said concrete slab being formed with shoulders embracing the heads of the said joists.

5. A concrete floor or roof construction comprising a plurality of mechanically compressed pre-fabricated concrete joists spaced apart, and the said joists reinforced with longitudinal reinforcing strands in the top and bottom of the DISCL 1,928,748.H0ward F. Young, Kalamazoo,

Patent dated October 3, 1933.

joists and having cross shear strands welded thereto, and a floor slab cast in place on forms or centering supported from the said joists, the said concrete slab being formed with shoulders embracing the top corners of the said joists for a distance down the sides less than one-half the height of the joists.

6. A concrete floor or roof construction comprising a plurality of pre-cast concrete joists spaced apart, and the said joists reinforced with longitudinal reinforcing strands in the top and bottom and having cross shear strands welded thereto, and a floor slab carried on forms or centering supported from the joists, the said concrete slab being formed with shoulders embracing the heads of the said joists.

'7. A concrete floor or roof construction comprising a plurality of pre-fabricated concrete joists spaced apart, and the said joists reinforced with longitudinal reinforcing strands in the top and bottom of the joists and having cross shear strands welded thereto, and a floor slab cast in place on forms or centering supported from the said joists, the said concrete slab being formed with shoulders embracing the top corners of the said joists for a distance down the sides less than one-half the height of the joists.

HOWARD F. YOUNG.

AIMER Mich. CONCRETE FLOOR CONSTRUCTION. Disclaimer filed September 25, 1942, by

Leonie S. Young, as assignee of one-half interest and as Administratrix of the Estate of said Howard F. Youn licensee, Lith-I-Bar Company.

g, Deceased (one-half interest); and the Hereby disclaim claims 2, 4, 6, and 7 of said Letters Patent.

[Oflicial Gazette October. 20, 1942.] 

